Flue-cutter.



. W. H. DAMON.

FLUE GUTTER.- v APPLICATION FILED FEB. 18, 1909.

Patented Jan. 11, V1910.

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ATTORNEYS UNITED STATES PATENT FFICF.

WILLIAM H. DAIVION, OF NEW YORK, N. Y.

ELITE-CUTTER.

Application filed February 18, 1909.

To all whom it may concern:

Be it known that I, WILLIAM H. DAMoN, a citizen of the United States,and a resident of the city of New York, Morris Park, borough of Queens,in the county of Queens and State of New York, have invented a new andImproved Flue-Cutter, of which the following is a full, clear, and exactdescription.

rIhe invention belongs to that class of line cutters in which a mandrelto fit within the flue is provided with an eccentrically-arrangedtool-carrying shaft having a limited relative rotary movement to projectand withdraw the tool.

The invention contemplates a fiue cutter of this character, in which themandrel has a yoke head and the shaft provided with a thumb controlledmember rigid with the shaft and arranged between the arms of the head.

Reference is to be had to the accompanying drawings forming a part ofthis specication, in which similar characters of reference indicatecorresponding parts in all the views.

Figure 1 is a central longitudinal section of a flue cutter constructedin accordance with my invention, the cutter being shown within the flueand in cutting position; Fig. 2 is a cross-section of the same on theline 2-2 of Fig. 1; Fig. 3 is a cross-section on the line 3 3 of Fig. 1,showing in dotted outline the position occupied by the toolholding shaftand cutting tool when the latter is retracted; and Fig. 4 is aperspective view of the cutting tool.

The invention in its more specific nature embodies a mandrel 5, of adiameter to t with comparative snugness within the flue, having a yokehead 6 at its outer end which is connected through a. universal joint 7to suitable power-driven means, generally a pneumatic motor. The mandrel5 is eccentrically bored to receive a tool-holding shaft 8, the latterbeing provided with a head 9 at its outer end, having a radiatingthumb-controlled member 10 which is arranged in the path of stop pins 11and 12, respectively, to limit the revolution of the tool-holding shaftin each direction. At an intermediate point of the tool-holding shaft itis provided with a diametrical slot or socket to receive the shank of acutting tool 13, the socket lying Specification of Letters Patent.

Patented J an. 11, 1910.

Serial No. 478,556.

v in the same transverse plane and in register with a circumferentialslot 14 in the mandrel 5, the slot extending around the mandrel forapproximately half its circumference.

The shank of the cutting tool is preferably of angular cross-section tooffset any tendency of the tool to turn in the tool-holding shaft, inwhich it is held against radial movement by a locking pin 15, the pinpassing centrally through the tool-holding shaft from the outer end ofthe latter, and at its inner end entering a recess 16 formed in the sideof the tool. The outer portion of the locking pin 15 is slightlyenlarged and threaded into the tool-holding shaft, as shown in Fig. 1.

Vhen the thumb-piece 10 is in contact with the stop pin 11, the cuttingtool is in the position indicated in dotted outline in Fig. 3, in whichposition the tool is fully withdrawn into the outline of the mandrel.When the thumb-piece 10 is in Contact with the stop-pin 12, the tool isfully projected and the point extends sufficiently beyond the mandrel topass through the wall of the flue, as shown in full lines in both Figs.1 and 3. The mandrel is passed within the flue until the inner flat faceof the head 6 contacts with the flange or bead of the flue adjoining theboiler flue sheet, the cutting tool at this time being fully retracted.The operator on placing his thumb on the thumbpiece 10 starts the motorto revolve the mandrel in the direction indicated by the arrows in Figs.2 and 3. rl`he momentary holding of the shaft by the thumb-piece 10causes the cutting edge of the tool to be projected sufficiently toengage the inner wall of the ue, at which time the feeding will continueautomatically until the thumbpiece strikes the stop 12, when the cutterwill be revolved with the mandrel and cut the flue completely in twoupon a single revolution. The operator then reverses the motor, whichoperates to automatically retract the cutter, at which time the tool maybe withdrawn from the flue.

Having thus described my invention, I claim as new and desire to secureby Letters Patent:

In a flue cutter, a mandrel having a yoke head rigid therewith, with theinner face of the head arranged to bear on the end of the Hue7 atool-holding shaft eecentreally In testimony whereof I have signed myJournaled 1n the mandrel, a thumb-connume to thls speolteatlon m thepresence o 'l0 trotted member 11g-1d Wlth the Shaft and two suhserlbmgWltnesses.

arrano'ed Within the yoke head of the mim= A T drel, znd d stopprojecting from the end of VILLAM H' DAMO" the mandrel and arranged nthe path of VtneSses: said member to limit the feeding movement JOHNSTEINER,

of. the shaft. AIDEN REDMOND.

